Evaluation of Occurrence, Concentration, and Removal of Pathogenic Parasites and Fecal Coliforms in Three Waste Stabilization Pond Systems in Tanzania

Table 4

Parasite concentrations and removal in the Iringa WSP system.

Parasite group	Parasite species	Treatment stage
		Raw wastewater	Anaerobic ponds	Facultative pond	Maturation ponds
Helminth species concentrations (eggs/L)	Ascaris lumbricoides	10	3	0	0
	Hookworm	9.5	0	0	7.5
	Trichuris trichiura	20	4.5	0	0
	Trichostrongylus spp	10	4.5	0	0
	Fasciola spp	0	0	0	0
	Taenia spp	0	0	0	0.25
Total helminth concentration (eggs/L)		49.5	12	0	7.75
Helminth removal at each stage (%)			75.8	100	No reduction
Helminth removal from raw wastewater (%)			75.8	100	85
Protozoa species concentrations ((oo)cysts/L)	Giardia lamblia	0	0	0	0
	Entamoeba coli	582.5	49.3	7.5	0.75
	Entamoeba histolytica/dispar	72	6	0	0
	Cryptosporidium spp	15	0	2	0.25
	Isospora spp	0	0	0	0
Total protozoa concentrations ((oo)cysts/L)		669.5	55.3	9.5	1
Protozoa removal at each stage (%)			91.7	82.8	89.5
Protozoa removal from raw wastewater (%)			91.7	98.6	99.9